ASHFIELD —“Archaeologists tell us all the (oldest) stonework in New England is colonial,” says stonemason James Vieira of Ashfield. “But that would be an absolute aberration – because there is similar stonework all over the world.”

Viera and the Rev. Richard Fournier will explore megalithic stone structures, from local sites and from distant places, in a talk Saturday evening in Town Hall, beginning at 6 p.m.

The talk and PowerPoint presentation is called “The Hidden History of Humanity,” and it’s free .

Vieira, a stonemason for 25 years, has drawn crowds in earlier lectures about precolonial stone structures that show advanced engineering and sophistication that goes beyond the usual explanations — that they must have been colonial root cellars or grain storage facilities.

Vieira has been studying stone anomalies for about 20 years. He has written feature articles for Ancient American Magazine, and is a member of the Northeast Antiquities Research Association.

Many of his lectures explore the mystery of the stone ruins of New England and the mound-building culture of ancient America and of lost civilizations.

Vieira has been presenting lectures on pre-history stone works with the Pioneer Valley Institute at Greenfield Community College and Franklin Land Trust.

Fournier of Cummington is pastor of the Mary Lyons Church in Buckland. He has studied ancient esoteric knowledge and spirituality for decades.

According to Vieira, the talk will present evidence of an advanced global maritime civilization that existed over 12,000 years ago.

“Ancient machining, impossible megalithic construction, and advanced mathematics in deep antiquity that all point to this culture will be explored,” he said. “The precession of the equinoxes, the 26,000-year astronomical cycle that ends on Dec 21, will be examined and the message transmitted through time from this ancient civilization will be discussed.”